Clamping-device.



P. OLBARY.

ULAMPING DvIGE,

APPLI'IJLTION FILED HAY 2T, 19H.

Patented Dec. 8. 1914.

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PATRICK OLEARY, OF NEW YORK, N. Y.

CLAMPING- DEVICE.

Specification of Letters Patent.

Patented Dec. 8, 1914.

Application led May 22, 1914. Serial No. 840,149.

To all whom 'it may concern Be it known that I, PATRICK OLEARY, acitizen of the United States, residing in the borough of Brooklyn, cityof New York, county of Kings, and State of New York, have inventedcertain new and useful Improvements in Clamping Devices, of which thefollowing is a specification.

My invention relates to improvements in a clamping device, and theobject of my invention 1s to provide a simple `and useful device for thepurpose of clamping sheets of paper or the like to a drawing-board orthe like. I accomplish this object by the device illustrated in theaccompanying drawings, in which- Figure 1 is a perspective View of thedevice. Fig. 2 is a vertical section of the same on the line 2-2 in Fig.1, and Fig. 3 is a cross section of the same on the line 3-3 in Fig. 1.

Similar characters refer to similar parts throughout the several views.

My device comprises a nut 1 provided with external screw threads 2, andformed with an upstanding flange 3, having an inwardly projecting lip 4,and preferably provided with a hexagonal inner face. The space withinthe flange 3 and lip 4 forms a chamber in which I provide an internallyscrew .threaded {ioating nut 5. This nut 5 is preferably hexagonal incross section, and fits loosely within the flange 3 of the nut 1. Theclamping headed screw shaft or member comprises an externally screwthreaded shaft 6 adapted to it into the floating nut 5 and to engage itsinternal screw threads and is provided with a fiat head section 7,preferably provided with a dished central section 8 which is milled orotherwise provide with a rough surface to enable it to be readily turnedby frictional engagement with the thumb of the operator. I also providea kerf or socket 9 to receive a pin or wrench of any desired formationfor the purpose of more easily turning the screw shaft 6. I alsopreferably cut a kerf 10 in the underside of the nut 1, whereby it maybe screwed into the table or drawingboard 11. My device being thusassembled, the nut 1 with its floating nut 5 is screwed into adrawing-board or table 11, with the upper edge section or lip 4 of thenut 1 preferably below the surface of the table, in which position it isadapted to receive the shaft 6 of the clamping member. The paper orother material to be clamped is then suitably adjusted with its edgebelow the flat head 7 of the clamping member 6, which is then screweddown upon the paper, securely clamping it to the board, and the papermay be released by a slight reverse turn of the clamping member 6. Byreason of the floating nut the head of the clamping member 6 will adjustitself to varying thicknesses of paper, and will securely clamp either avery thin or very thick sheet.

Having thus described my invention, what I claim is:

1. In a device of the character described, the combination of a nutadapted to be positioned in a table and formed with .an upstandingflange provided with an inwardly projecting lip, forming a chamber inwhich is disposed a screw threaded floating nut adapted to receive ascrew threaded clamping member.

Q. In a device of the character described, the combination of a nutadapted to be positioned in a table and formed with an upstanding flangeprovided with a plurality of flat inner faces and having an inwardlvprojecting lip, is disposed a screw threaded lioating nut having aplurality1 of flat faces and adapted to receive a screw threadedclamping membei'.

3. In a device of the character described, the combination of a nutadapted .to be positioned in a table and formed with an upstandingflange provided with a plurality of flat inner faces, forming a chamber1n which is disposed a screw threaded floating nut having a plurality offlat faces and adapted to receive a screw threaded clamp- `ing member.

In testimony whereof, I have signed my name to this specification in thepresence or two subscribing witnesses, this 19th day of May, 1914.

PATRICK OLEARY.

Witnesses:

JUSTINE P. GALLAND, HENRY B. THOMPSON.

forming a chamber in which

